#write a function add_one that has one parameter, one dimensional list
#function adds 1 to each list element
#no return value

#Write main that randomly generates list of 10 integers, each integer
#between -2 and 2. Program prints original list,calls the function, and 
#prints list after function execution 

#Example:
#Suppose the original list is:     -2 1 0 0 1 1 -1 2 0 1
#after function execution list is: -1 2 1 1 2 2  0 3 1 2
import random
def add_one(my_list):
	size=len(my_list)
	for i in range(size):
		my_list[i]=my_list[i]+1
	#no return value
	#you can write
	#return 	
	#but its not required

def main():
	my_list=[]
	for i in range(10):
		my_list.append(random.randint(-2,2))
	print("original list")
	print(my_list)
	#function call
	add_one(my_list)
	#pay attention, you don't have any variable to do assignment 
	#statement, since function doesn't have return value

	print("list values after function call")
	print(my_list)
	#one dimensional lists in Python are REFERENCE parameters
	#meaning: function can make changes to list elements
	#and these changes preserved after function execution is completed


main()